Posted on /theoldmotor.com/ with caption as follows:
An interesting set of images taken in California in 1920. The White racing car on the left is one of the old Buick Bug’s that were successful racing cars that Buick built c1910. The other two small cars I believe were made for amusement purposes or could have been some older cycle cars that were used in racing. Cycle cars were raced in the mid teens at the height of the cycle car craze.
Note right hand car is chain drive suggesting motorcycle engine under the 'hood'.